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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4b441f1e591406a79ce507e71290af2260375ca012349899fe62e375931bb9' 
  AND token = 'Jc3T532k5E+ODCC8MJqKWFMBvQWHjJ7KDfPCoUuwTPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}